Pasteur’s Tweezers Revisited: On the Mechanism of Attrition-Enhanced Deracemization and Resolution of Chiral Conglomerate Solids

Pasteur’s Tweezers
Revisited: On the Mechanism
of Attrition-Enhanced Deracemization and Resolution of Chiral Conglomerate
Solids:

Journal of the American Chemical Society

DOI: 10.1021/ja303566g

Modeling the Signatures of Hydrides in Metalloenzymes: ENDOR Analysis of a Di-iron Fe(μ-NH)(μ-H)Fe Core

Modeling the Signatures
of Hydrides in Metalloenzymes: ENDOR Analysis of a Di-iron Fe(μ-NH)(μ-H)Fe
Core:

Journal of the American Chemical Society

DOI: 10.1021/ja303739g

The Facile Reduction of Carbon Dioxide to Carbon Monoxide with an Amido-Digermyne

The Facile Reduction of Carbon Dioxide to Carbon Monoxide with an Amido-Digermyne:

Taking the fizz out: A digermyne compound with a GeGe single bond has been shown to quantitatively reduce CO₂ to CO at temperatures as low as −40 °C. The mechanism of this unprecedented reaction has been probed by spectroscopic and computational techniques and involves a metastable intermediate (see picture, Ar*=C₆H₂{C(H)Ph₂}₂Me-2,6,4).

Modeling the Signaturesof Hydrides in Metalloenzymes: ENDOR Analysis of a Di-iron Fe(μ-NH)(μ-H)FeCore

Modeling the Signatures
of Hydrides in Metalloenzymes: ENDOR Analysis of a Di-iron Fe(μ-NH)(μ-H)Fe
Core:

Journal of the American Chemical Society

DOI: 10.1021/ja303739g

Hydrogenases as electrocatalysts [Chemistry]

Hydrogenases as electrocatalysts [Chemistry]: The extraordinary ability of Fe- and Ni-containing enzymes to catalyze rapid and efficient H+/H2 interconversion—a property otherwise exclusive to platinum metals—has been investigated in a series of experiments combining variable-temperature protein film voltammetry with mathematical modeling. The results highlight important differences between the catalytic performance of [FeFe]-hydrogenases and [NiFe]-hydrogenases and justify a simple model for reversible catalytic electron flow in enzymes and electrocatalysts that should be widely applicable in fields as diverse as electrochemistry, catalysis, and bioenergetics. The active site of [FeFe]-hydrogenases, an intricate Fe-carbonyl complex known as the “H cluster,” emerges as a supreme catalyst.

An Efficient Iridium Catalyst for Reduction of Carbon Dioxide to Methane with Trialkylsilanes

An Efficient Iridium Catalyst
for Reduction of Carbon
Dioxide to Methane with Trialkylsilanes:

Journal of the American Chemical Society

DOI: 10.1021/ja305318c

An Efficient Iridium Catalystfor Reduction of CarbonDioxide to Methane with Trialkylsilanes

An Efficient Iridium Catalyst
for Reduction of Carbon
Dioxide to Methane with Trialkylsilanes:

Journal of the American Chemical Society

DOI: 10.1021/ja305318c

Reactivity of Bis(3,5-dimethylpyrazol-1-yl)methyllithium with S or CS2, Followed by Reaction with Fe3(CO)12 and Ar3SnCl or RX: Unexpected Formation of (3,5-Dimethylpyrazol-1-yl)dithioformate Derivatives

Reactivity of Bis(3,5-dimethylpyrazol-1-yl)methyllithium
with S or CS2, Followed by Reaction with Fe3(CO)12 and Ar3SnCl or RX: Unexpected Formation
of (3,5-Dimethylpyrazol-1-yl)dithioformate Derivatives:

Organometallics

DOI: 10.1021/om300448a

An iridium-pyridylpyrrolide complex exhibiting reversible binding of H2

An iridium-pyridylpyrrolide complex exhibiting reversible binding of H2:

Dalton Trans., 2012, Advance Article
DOI: 10.1039/C2DT30981E, Communication

Keith Searles, Maren Pink, Kenneth G. Caulton, Daniel J. Mindiola
The synthesis, characterization, and reactivity of a series of iridium(I) and iridium(III) complexes supported by a 3,5-bis(trifluoromethyl)-2-(2[prime or minute]-pyridyl)pyrrole (L^-) ligand are reported.
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Biomimetic Models for the Active Site of [Fe]Hydrogenase Featuring an Acylmethyl(hydroxymethyl)pyridine Ligand

Biomimetic Models for
the Active Site of [Fe]Hydrogenase Featuring an Acylmethyl(hydroxymethyl)pyridine
Ligand:

Inorganic Chemistry

DOI: 10.1021/ic301146u

Main Group Redox Catalysis: Reversible PIII/PV Redox Cycling at a Phosphorus Platform

Main Group Redox Catalysis:
Reversible PIII/PV Redox Cycling at a Phosphorus
Platform:

Journal of the American Chemical Society

DOI: 10.1021/ja302963p

Palladium-mediated Cleavage of S–C Bonds: Preparation and Characterization of Palladium(II) Complexes of 2, 6-Diformyl-4-tert-butylthiophenol Dioxime

Palladium-mediated Cleavage of S–C Bonds: Preparation and Characterization of Palladium(II) Complexes of 2, 6-Diformyl-4-tert-butylthiophenol Dioxime:

Abstract

The synthesis of air-sensitive 2, 6-diformyl-4-tert-butylthiophenol dioxime H₃L3 was achieved by a Pd-mediated S–C cleavage of the corresponding S-tert-butyl protected thioether. The novel ligand forms a dinuclear, neutral Pd^II₂ complex, which is stabilized by two N···HO hydrogen bonds to give a pseudo-macrocyclic structure. The crystal structure of a Pd^II complex of an oxidized isothiazole derivative of H₃L3 is also reported.

Tungsten(II) Alkylimido Complexes from Insertion of Nitriles into Tungsten Hydride: Alkylideneamido Intermediate Stage and Nitrene Group Transfer to Isocyanide

Tungsten(II) Alkylimido
Complexes from Insertion of Nitriles into Tungsten Hydride: Alkylideneamido
Intermediate Stage and Nitrene Group Transfer to Isocyanide:

Organometallics

DOI: 10.1021/om3004338

this ligand could be installed on Fe2(pdt)

Synthesis, Structural Characterization, and Properties of Some Functionalized Phosphine-Containing Diiron Complexes As Models for the Active Site of [FeFe]-Hydrogenases

Synthesis, Structural
Characterization, and Properties of Some Functionalized Phosphine-Containing
Diiron Complexes As Models for the Active Site of [FeFe]-Hydrogenases:

Organometallics

DOI: 10.1021/om300418z

Synthesis of a Stable 1,2-Bis(ferrocenyl)diphosphene

Synthesis of a Stable 1,2-Bis(ferrocenyl)diphosphene:

Chem. Commun., 2012, Accepted Manuscript
DOI: 10.1039/C2CC33277A, Communication

Takahiro Sasamori, Michiyasu Sakagami, Masatoshi Niwa, Heisuke Sakai, Yukio Furukawa , Norihiro Tokitoh
A stable 1,2-bis(ferrocenyl)diphosphene, where two ferrocenyl units are bridged by a P=P [small pi]-bond, has been synthesized. It represents an unprecedented class of d-[small pi] electron systems containing a heavier pnictogen [small pi]-spacer...

methods for bulking up Fc's

Synthesis, Electronic Structure, and Alkene Hydrosilylation Activity of Terpyridine and Bis(imino)pyridine Iron Dialkyl Complexes

Synthesis, Electronic
Structure, and Alkene Hydrosilylation
Activity of Terpyridine and Bis(imino)pyridine Iron Dialkyl Complexes:

Organometallics

DOI: 10.1021/om3004527

Are Free Radicals Involved in IspH Catalysis? An EPR and Crystallographic Investigation

Are Free Radicals Involved
in IspH Catalysis? An EPR
and Crystallographic Investigation:

Journal of the American Chemical Society

DOI: 10.1021/ja303445z

Weixue Wang and Prof. Oldfield

Transfer hydrogenation with a ferrocene diamide ruthenium complex

Transfer hydrogenation with a ferrocene diamide ruthenium complex:

Dalton Trans., 2012, 41,7852-7854
DOI: 10.1039/C2DT31075A, Communication

Andrew G. Elliott, Aaron G. Green, Paula L. Diaconescu
The use of a 1,1[prime or minute]-ferrocenediamide ruthenium complex as a mediator for base-free transfer hydrogenation is reported.

Photoinduced hydrogen evolution in supramolecular devices with rhenium photosensitizer linked to a FeFe-hydrogenase model complexes

Photoinduced hydrogen evolution in supramolecular devices with rhenium photosensitizer linked to a FeFe-hydrogenase model complexes:

Dalton Trans., 2012, Accepted Manuscript
DOI: 10.1039/C2DT30468F, Paper

Jian-Hui Liu, Wei-Na Jiang
Coordination of the pyridinyl-attached diiron azadithiolate hexacarbonyl complexes (2 and 3) through the pyridinyl nitrogen to the Re on 10-phenanthroline rhenium (5a) and 2,9-diphenyl-1,10-phenanthroline rhenium (5b) forms respectively novel [Re-Fe]...

N-H bond activation by palladium(II) and copper(I) complexes featuring a reactive bidentate PN-ligand

N-H bond activation by palladium(II) and copper(I) complexes featuring a reactive bidentate PN-ligand:

Dalton Trans., 2012, Advance Article
DOI: 10.1039/C2DT31009K, Paper

Sandra Y. de Boer, Yann Gloaguen, Joost N. H. Reek, Martin Lutz, Jarl Ivar van der Vlugt
Backbone reactivity of a bidentate PN-ligand in the context of N-H activation leads to Pd^II and Cu^I amido complexes.

Relate-able to Hmd models?

Multinuclear metalladithiolenes: focusing on electronic communication in mixed-valent states

Multinuclear metalladithiolenes: focusing on electronic communication in mixed-valent states:

Dalton Trans., 2012, Advance Article
DOI: 10.1039/C2DT30787A, Perspective

Ryota Sakamoto, Satoru Tsukada, Hiroshi Nishihara
This Perspective addresses our recent studies relating to metalladithiolenes and their cluster complexes exhibiting peculiar electronic communication in mixed-valent (MV) states.

[{Cp[prime or minute]Fe([small mu ]-OH)}3]: the synthesis of a unique organometallic iron hydroxide

[{Cp[prime or minute]Fe([small mu ]-OH)}3]: the synthesis of a unique organometallic iron hydroxide:

Dalton Trans., 2012, Advance Article
DOI: 10.1039/C2DT31103H, Communication

Marc D. Walter, Peter S. White
Addition of stoichiometric quantities of H₂O to the pogo-stick complex [Cp[prime or minute]FeN(SiMe₃)₂] yielded the trimeric [{Cp[prime or minute]Fe([small mu ]-OH)}₃] complex in which the high-spin iron(II) centres exhibit antiferromagnetic exchange coupling.

A Copper (II)-ethylenediamine modified polyoxoniobate with photocatalytic H2 evolution activity under visible light irradiation

A Copper (II)-ethylenediamine modified polyoxoniobate with photocatalytic H2 evolution activity under visible light irradiation:

Dalton Trans., 2012, Accepted Manuscript
DOI: 10.1039/C2DT30663H, Communication

Zhen-Li Wang, Hua-Qiao Tan, Wei-Lin Chen, Yang-Guang Li, Enbo Wang
A new dimer polyoxoniobate K2[Cu(en)2]15[Nb24O72H8]2-39H2O (1) has been synthesized and systematically characterized. Visible light photocatalytic H2 evolution activity was researched with 1 as the visible-light photosensitizer and catalyst, cobaloximes [CoIII(dmgH)2pyCl]...

Rearrangements of phosphinoimines to phosphine-imines in ruthenium chelate complexes

Rearrangements of phosphinoimines to phosphine-imines in ruthenium chelate complexes:

Dalton Trans., 2012, Advance Article
DOI: 10.1039/C2DT30505D, Paper

Christopher C. Brown, Douglas W. Stephan
Thermal reaction of 1 : 1 mixtures of the RuCl₂(PPh₃)₃ and phosphinoimine R₂PN[double bond, length as m-dash]CPh₂ (R = Ph, iPr, Me) at 140 [degree]C results in isolation of the dimeric species [RuCl([small mu ]-Cl)(PPh₃)(C₆H₄(PPh₂)C(Ph)NH)]₂ (R = Ph 1, iPr 2, Me 3) containing phosphine-imine chelating ligands.

Antiproliferative Activity of PtII Complexes with Carboxylated Phosphanes in Chelated or Ring-Opened Forms

Antiproliferative Activity of PtII Complexes with Carboxylated Phosphanes in Chelated or Ring-Opened Forms:

Abstract

The biological activity of four cisplatin-like Pt–phosphane complexes, namely, cis-[PtCl₂(L)₂], L = PPh₃, P(Ph)₂(p-C₆H₄-COOH), P(Ph)₂(-CH₂CH₂-COOH) and its succinimidyl ester derivative, has been tested on monolayer cultures of three tumour cell lines (namely, A2780 human ovarian carcinoma and its cisplatin-resistant form A2780Cp8, and human colon adenocarcinoma HCT116). These complexes can undergo intramolecular rearrangements by virtue of their functionalized phosphanes, thereby existing as fully opened (O) or fully closed (C) forms. Our results show that only the opened forms exhibit moderate activity, which, although inferior to the activity exhibited by the archetype metallo-drug cisplatin, is substantially retained in the A2780Cp8 cell line, yielding very low resistance factors. The trend is also maintained on the less cisplatin-sensitive HCT116 line. When the complexes assume the bis-chelated (C) form, the antiproliferative activity is deeply reduced. Two Pt-amine congeners, containing β-alanine and 3-methoxypropylamine, with C and O structures, respectively, were synthesized and their antiproliferative propensity was evaluated for comparison purposes, and a similar scenario was observed.

The biological activity of four cisplatin-like Pt–phosphane complexes has been tested. Some of the complexes can undergo intramolecular rearrangement by virtue of the functionalized phosphanes (fully opened/fully closed forms). The results show that only the opened forms exhibit moderate activity, which is substantially retained in the cisplatin-resistant cell lines.

Phosphane-Pyridine Iron Complexes: Synthesis, Characterization and Application in Reductive Amination through the Hydrosilylation Reaction

Phosphane-Pyridine Iron Complexes: Synthesis, Characterization and Application in Reductive Amination through the Hydrosilylation Reaction:

Abstract

A series of 6 cyclopentadienyl phosphanyl-pyridine piano-stool iron complexes was prepared in good yields, characterized, and studied in the catalytic reductive amination of benzaldehyde derivatives through hydrosilylation reactions by using polymethylhydrosiloxane as the hydrosilane source and in dimethylcarbonate as the solvent at 40 °C. Single-crystal X-ray structural analyses were performed for all the complexes.

A series of 6 cyclopentadienyl phosphanyl-pyridine piano-stool iron complexes was prepared, characterized, and studied in the catalytic reductive amination of benzaldehyde derivatives in dimethylcarbonate through hydrosilylation reactions by using polymethylhydrosiloxane as the hydrosilane source.

Photocatalytic Hydrogen Production from a Simple Water-Soluble [FeFe] Hydrogenase Model System

Photocatalytic Hydrogen Production from a Simple Water-Soluble [FeFe] Hydrogenase Model System:

Chem. Commun., 2012, Accepted Manuscript
DOI: 10.1039/C2CC33097K, Communication

Li-Zhu Wu, Wei-Ning Cao, Feng Wang, Hong-Yan Wang, Bin Chen, Ke Feng, Chen-Ho Tung
Combined with a simple water soluble [FeFe] hydrogenase mimic 1, [Ru(bpy)3]2+ and ascorbic acid enable to produce hydrogen photocatalytically. More than 88 equivalents of H2 was achieved in water, which...